[...]
Online court records show a woman filed a petition in the state District Court in Santa Fe in early December to establish custody and child support for Owen.
The woman’s lawyer, Nathaniel Thompkins, said she was never married to Propes. The court needed to establish parentage to determine child support, Thompkins said.
Propes was due in court Wednesday for a hearing in the custody case, court records show, but Thompkins said the man didn’t show up.
The next day, deputies say, he killed the boy and himself.[...]